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IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.最新文献

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Quasi-orthogonal space-frequency block code 准正交空频分组码
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1413865
Gangyoul Yu, Joonhyuk Kang
{"title":"Quasi-orthogonal space-frequency block code","authors":"Gangyoul Yu, Joonhyuk Kang","doi":"10.1109/ISCIT.2004.1413865","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1413865","url":null,"abstract":"Orthogonal frequency division multiplexing (OFDM) with space frequency block code (SFBC) outperforms OFDM with space time block code (STBC) in the fast fading channel environment. However, a complex orthogonal code with code rate one does not exist for more than two antennas. To increase the throughput, we propose a quasi-orthogonal SFBC-OFDM system with the four transmit antennas. Simulation shows a tradeoff between the advantage of the SFBC in the mobile communication environment and the improved throughput which achieves code rate one.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128504563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
Stability analysis and H/sub /spl infin// norm computation of 2D discrete systems described by Fornasini-Marchesini second model Fornasini-Marchesini第二模型描述的二维离散系统稳定性分析及H/sub /spl infin//范数计算
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1413834
Y. Ito, W. Date, N. Babaguchi
{"title":"Stability analysis and H/sub /spl infin// norm computation of 2D discrete systems described by Fornasini-Marchesini second model","authors":"Y. Ito, W. Date, N. Babaguchi","doi":"10.1109/ISCIT.2004.1413834","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1413834","url":null,"abstract":"The paper presents a stability criterion and a method for computing the H/sub /spl infin// norm of 2D discrete systems. Both methods are based on linear matrix inequalities (LMI), and, hence, they are computationally tractable. In deriving these methods, the finite-order Fourier series approximation of the solution for frequency-dependent LMI (FDLMI), and the properties of the quadratic form representation of finite-order Fourier series play key roles. From the point of view of the proposed methods, existing LMI-based methods can be regarded as ones which are obtained by the Fourier series approximation of order zero, and thus, it is expected that the proposed methods lead to less conservative results. This is illustrated by numerical examples. The effectiveness of the proposed methods is also illustrated by numerical examples.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128679458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Design of multiplierless elliptic narrowband IIR digital filter based on sensitivity analysis 基于灵敏度分析的无乘法器椭圆窄带IIR数字滤波器设计
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1412473
A. Trirat, S. Chivapreecha, T. Khunaworawet, T. Ruangrangsan, K. Dejhan
{"title":"Design of multiplierless elliptic narrowband IIR digital filter based on sensitivity analysis","authors":"A. Trirat, S. Chivapreecha, T. Khunaworawet, T. Ruangrangsan, K. Dejhan","doi":"10.1109/ISCIT.2004.1412473","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1412473","url":null,"abstract":"In this paper, we present a technique for the design of narrowband multiplierless IIR filter based on sensitivity analysis. All the multiplication constants in the proposed filter structure are implemented with a small number of shift registers and adders. It is shown in the paper that by appropriated design of the elliptic minimal Q-factor (EMQF) prototyped transfer function, (n+1)/2 multiplication constants of highest sensitivity can be implemented without quantization. The quantization of the remaining (n-1)/2 less-sensitivity constants is performed using phase-tolerance scheme.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128697714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A configurable multicast multimedia framework supporting adaptive QoS 支持自适应QoS的可配置组播多媒体框架
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1412868
H. Kung, Yen-Yen Liu, Chia-Ni Liu
{"title":"A configurable multicast multimedia framework supporting adaptive QoS","authors":"H. Kung, Yen-Yen Liu, Chia-Ni Liu","doi":"10.1109/ISCIT.2004.1412868","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1412868","url":null,"abstract":"For traditional server-to-client architecture, the sender adjusts its transmission rate according to some feedback from its receiver. But in the multicast environment, feedback messages from receivers in a multicast group of indeterminate size might induce a feedback implosion problem, in which a potentially large number of feedback messages are sent almost synchronously from the group receivers back to the server. Thus, in order to support the scalability and the heterogeneity of a multicast communication environment, the number of feedback messages must be reduced and the feedback messages should be determined in an efficient and systematic way. To solve the problem of feedback implosion and provide a smooth multimedia presentation with heterogeneous QoS considerations, we propose the configurable Multicast Multiple-stream Multimedia Streaming System (M/sup 3/SS), which is composed of the client, virtual servers, and physical servers. The M/sup 3/SS specification mechanism provides that each virtual server with a local decision as to its measurement on the state of the network by adopting the proposed feedback control scheme, and sends a feedback message back to the physical server. We then propose two schemes: the dynamic feedback control and the periodic feedback control. Based on the dynamic and periodic feedback control schemes, the physical server respectively adopts the multi-rate adaptive control scheme and the average-rate adaptive control scheme to satisfy the heterogeneous network considerations and to accommodate most LAN conditions, and then can utilize the available network bandwidth as much as possible. M/sup 3/SS achieves smooth multiple-stream multimedia presentations based on the proposed QoS-considered adaptation control schemes for continuous and static media streams.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129991476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Spatial-temporal propagation parameter estimation in the asynchronous DS-CDMA systems over fading channel 衰落信道下异步DS-CDMA系统的时空传播参数估计
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1412472
R. Wu, T. Ristaniemi
{"title":"Spatial-temporal propagation parameter estimation in the asynchronous DS-CDMA systems over fading channel","authors":"R. Wu, T. Ristaniemi","doi":"10.1109/ISCIT.2004.1412472","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1412472","url":null,"abstract":"This paper is concerned with code timing and direction-of-arrival (DOA) estimation, called two-dimensional code acquisition, in asynchronous direct sequence spread spectrum communication systems with the presence of Rayleigh fading effects. An antenna array is used in this paper. A method named independent component analysis frequency selection (ICA-FS) is used to perform interference suppression before parameter estimation. The operation for suppressing interference brings a decrease in undesired Gaussian effects. The ICA-FS requires a training sequence corresponding to the desired user to be known, and data signals corresponding to different users to be statistically independent.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129116621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
On the PAPR reduction for wavelet based transmultiplexer 基于小波的多路复用器的PAPR降低
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1413829
Khoirul Anwar, A. U. Priantoro, Masato Saito, T. Hara, Minoru Okada, Heiichi Yamamoto
{"title":"On the PAPR reduction for wavelet based transmultiplexer","authors":"Khoirul Anwar, A. U. Priantoro, Masato Saito, T. Hara, Minoru Okada, Heiichi Yamamoto","doi":"10.1109/ISCIT.2004.1413829","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1413829","url":null,"abstract":"This paper investigates the peak-to-average power ratio (PAPR) of a wavelet based transmultiplexer for a high-speed digital communications system. A transmultiplexer based on wavelet in conjunction with the spread spectrum technique, has been shown to exhibit good performance while having good spectral properties. On the other hand, a common issue with multicarrier modulation systems is the PAPR due to the superposition of a large number of independently modulated subcarriers in parallel at the transmitter. Reducing PAPR is essential for realizing power efficient devices, which is an important issue for future generations of mobile communication systems. Our computer simulation results clarified that Haar wavelet based transmultiplexers exhibit low PAPR values when frequency domain spreading using Hadamard code is employed. This result is similar to the case of orthogonal frequency division multiplexing (OFDM) where carrier interferometry (CI) codes were demonstrated to exhibit low PAPR values.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132999854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 13
Symmetry-based low-complexity variable fractional-delay FIR filters 基于对称的低复杂度可变分数延迟FIR滤波器
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1412478
T. Deng
{"title":"Symmetry-based low-complexity variable fractional-delay FIR filters","authors":"T. Deng","doi":"10.1109/ISCIT.2004.1412478","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1412478","url":null,"abstract":"This paper reveals the coefficient symmetry of variable fractional-delay (VFD) finite-impulse-response (FIR) digital filters and shows that the coefficient symmetry can be efficiently exploited in the VFD filter design. Compared with the conventional weighted-least-squares (WLS) design methods without using coefficient symmetry, the proposed symmetry-based WLS method requires only half of the filter coefficients to achieve higher design accuracy. This symmetry exploitation not only significantly reduces the computational complexity required in the design process, but also leads to low-cost implementation.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130244903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Power-efficient design of memory-based FFT processor with new addressing scheme 基于新寻址方案的内存FFT处理器的节能设计
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1413801
Seungbeom Lee, Duk-Bai Kim, Sin-Chong Park
{"title":"Power-efficient design of memory-based FFT processor with new addressing scheme","authors":"Seungbeom Lee, Duk-Bai Kim, Sin-Chong Park","doi":"10.1109/ISCIT.2004.1413801","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1413801","url":null,"abstract":"The paper presents a new memory-addressing scheme for the realization of low power FFT processors. The scheme is based on the minimization of coefficient access and the reduction of switching activity by modifying the butterfly sequence. Therefore, power consumption in the complex multiplier and memory is significantly saved.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130291149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Low distortion digital pulse width modulation for audio class-D amplifier 用于音频d类放大器的低失真数字脉宽调制
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1412898
A. Yoneya, A. Watanabe
{"title":"Low distortion digital pulse width modulation for audio class-D amplifier","authors":"A. Yoneya, A. Watanabe","doi":"10.1109/ISCIT.2004.1412898","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1412898","url":null,"abstract":"A pulse width modulation scheme for a high fidelity digital audio amplifier is presented. The uniform PWM is used to utilize the over sampling technology, but the UPWM causes harmonic distortion. The harmonic distortion components at the PWM output are estimated using the derivatives of the input signal and cancelled at the input of the delta-sigma modulator. The output signal of the delta-sigma modulator is coarsely quantized with shaped noise and fed to the pulse width modulator. A simulation result for a dual tone test is presented to illustrate the effectiveness of the proposed method.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"257 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122293451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Face animation parameters extraction and driving 人脸动画参数提取与驱动
IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI: 10.1109/ISCIT.2004.1413918
Ke Wang, Baocai Yin, Jintong Guo, Shuyan Ma
{"title":"Face animation parameters extraction and driving","authors":"Ke Wang, Baocai Yin, Jintong Guo, Shuyan Ma","doi":"10.1109/ISCIT.2004.1413918","DOIUrl":"https://doi.org/10.1109/ISCIT.2004.1413918","url":null,"abstract":"A new method combining the CANDIDE model with the Lucas-Kanade algorithm is proposed to track face features and extract face animation parameters. To adapt a general mesh model to a specific face scan data, a face model is made. Combining the parameter model and muscle model, the face animation is created finally by driving face animation parameters. The experimental results show the face animation parameter extraction and driving are accurate.","PeriodicalId":237047,"journal":{"name":"IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126922089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
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